HIGH-STRENGTH STEEL FOR REDUCER GEARS OF NEW ENERGY VEHICLES AND MANUFACTURING METHOD THEREFOR

A high-strength steel for reducer gears of new energy vehicles and a manufacturing method therefor. The chemical composition mass percentages of the gear steel are C: 0.13-0.18%, Si: ≤0.15%, Mn: 1.10-1.35%, Cr: 1.20-1.45%, P: ≤0.012%, S: ≤0.003%, Ni: 0.15-0.35%, Mo: 0.05-0.20%, Al: 0.015-0.050%, Nb:...

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Hauptverfasser:	CAO, Hongfu, WU, Xiaolin, LU, Mingxia, LIAO, Shuquan, BAI, Yun, SUN, Hongping, ZHANG, Xuecheng, MENG, Yu, SUN, Wei, LU, Zhangwei
Format:	Patent
Sprache:	chi ; eng ; fre
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A high-strength steel for reducer gears of new energy vehicles and a manufacturing method therefor. The chemical composition mass percentages of the gear steel are C: 0.13-0.18%, Si: ≤0.15%, Mn: 1.10-1.35%, Cr: 1.20-1.45%, P: ≤0.012%, S: ≤0.003%, Ni: 0.15-0.35%, Mo: 0.05-0.20%, Al: 0.015-0.050%, Nb: 0.015-0.050%, N: 0.0085-0.0225%, and B: 0.0015-0.0035%, the balance being Fe and unavoidable impurities. After the processing steps of primary refining-refining-vacuum degassing-continuous casting-hot delivery-rolling-isothermal heat treatment, etc., the steel banded structure is ≤1.5 grade, the hardness of the steel is ≤160 HBW, the austenite grain size of the steel is ≥8, there are no cracks defected on the surface of the steel, and the tensile strength of the steel after 870℃ oil quenching+200℃ tempering is ≥1180 MPa. L'invention concerne un acier à haute résistance pour engrenages réducteurs de véhicules à énergie nouvelle et son procédé de fabrication. Les pourcentages en masse de composition chimique de l'ac